Switch



Patented May 7 192576 UNITE star-ss BLAKE PALM, OF WASHINGTON, DSTRICT OF COLUMBIA.

SWITCH.

Application led February This invention relates to au electric switch', and more particularly to au electric switch especially designed for use in connection with elevators or the like, the primary ob- 5 ject of the invention being` to provide a switch which will be positive in its operation and one which will be exceptionally strong and durable to withstand the rough usage to which a switch of this character is 10 subjected.

An important object of the invention is to provide a switch wherein the cooperating contact members will be clean at all times, thereby insuring a true contact between the members to insure the operation of the mechanism controlled by the switch.

A further object of the invention is to provide a switch embodying a removable side plate andaremovable front plate to the end that should the switch be employed at a position within a mort-iss, the interior elements of the switch may be removed by removi Y the end plate, allowing easy access to the conduits and switch elements of the switch.

A still further object of the invention is to provide a tubular plunger mounted so that it *may rotate within the switch housing, thereby movingthe contact ring carried thereby and changing the contact points between the switch arms and ring to insure a true Contact.

'Vith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing:

Figure 1 is a longitudinal sectional view through a switch constructed in accordance with the invention.

Figure 2 is a. sectional view taken on line 2 2 of Figure 1.

Figure 3 isa transverse sectional view through the switch.

Referring to the drawing in detail, the device includes a box-like body portion or housing indicated generally by the reference character 5, the same being constructed of 4, 1926. Serial N0. 85,975.

suitablelmetal and havingl ears (S extending from the ends thereof, lthrough which ears, 55 securing bolts, not shown may be passed to secure the switch in position.

An opening is formed in one end wall of the housing through which the lead wires indicated at T may pass, the wires 7 being con- 60 nected with the terminals 8 as clearly shown by Figure 1, which terminals are secured within the insulating blocks 9 that are secured to the removable end plate 10 to be hereinafter more fully described. es

Contact arms indicated at 11 are secured by means of the terminals 8 to the insulating blocks 9 and have their opposite ends extending inwardly where they are provided with contact members 12 adapted to rub the contact ring 13 carried by the tubular plunger 14 which is formed preferably of fibrous material to insulate the contact points associated therewith, from the casing or housing of the switch.

As shown, the tubular member 14 moves over the metallic supporting linger 15 which is carried by the rear wall of the housing, the saine being of a length to permitl of sufficient movement of the tubular member to so accon'iplish its purpose.

At the outer end of the tubular member 14- is a head 16 preferably metal to withstand the wear to which it will be subjected while in use. The outer surface of the head 16 is 55 rounded as shown by Figure 1 so that the member which is carried by the door and adapted to cooperate with the head 16 will slide thereover.

Mounted between the nger 15 and head no 16 is a coiled spring 17 which is designed to normally urge the tubular member or plunger 14- outwardly to disconnect the contact members of the switch, when the door, which in the present showing is indicated at ua 1S, is moved out of engagement with the switch member.

Extending through the member 14 a cotter key 19 which not only tensions the spring 17, but is adapted to engage the end lou plate 10 adjacent to the enlargement 20, to act as a stop for limiting the movement of the member 14.

It mightl be further stated that an opening is formed through the plate 10 and through 105 the enlargement 20, the wall of the opening blocks secured to the end plate, Contact arms secured to the insulating blocks and adapted to yengage the circular' Contact member to complete a circuit therethrough, Wires extending into the housing and in circuit with the Contact arms, and said Contact arms and insulating blocks adapted to be removed with the removable end plate.

f' ln testimony that I claim the foregoing as my own, I have hereto aiiXed my signature.

BLAKE PALM. 

